Abstract: In an information providing system, a condition notifying part is provided by a providing part to the user terminal with information that is in accordance with a request of the user terminal, is activated in a user terminal connecting to the information providing system via a network and notifies of a condition of the user terminal. In addition, a session management part manages session information in accordance with the condition of the user terminal notified by the condition notifying part activated in the user terminal. A session between the information providing system and the user terminal is established when the user is authenticated in accordance with authentication information from the user terminal and the session information managed by said session management part.

Abstract: A noise barrier includes upright-standing support columns spaced a predetermine distance from each other and each made of an H section, and a plurality of wall panels provided between two neighboring ones of the support columns by inserting each wall panel at opposite lateral edges thereof from above into U-shaped recesses, opposite to each other, of the support columns, the plurality of wall panels being thus stacked one on another to form a main soundproof wall, and a noise control module to be installed on the topmost wall panel, the noise control module comprising side frame members to be inserted at lower ends thereof from above into the upper portions of the U-shaped recesses, opposite to each other, of the support columns; a lower frame member connecting the side frame members to each other by securing them at lower ends thereof to the lower frame member; first and second additional screens installed at lower ends thereof pivotably to the lower frame member and having a horizontal length smaller than t